@aalkhalifa : I mangaged to get it work by sending ir signals via logitech ultimate hub and now finally with IRtrans a seperate unit which sends out ir signals with http requests. Not the solution I wished for but it works. Hopefully they will create native flic app support one day.
Please contact the developer of that app since what we do is basically using the system's forward command. If they interpret it wrong there's nothing we can do about that.